In recent years, growing population and expansion of settlements and infrastructures over hazardous areas have largely increased the impact of natural disasters in our country. This force our government to enact a law “Geological Law”, that stress the importance of national hazard mitigation through identification of hazard-proned area and require natural hazard should be assessed by planners and decision makers from the early stages. Therefore, the government or related institutions have the responsibility to provide, promote and disseminate information to public about natural disasters mitigation. The hazard information should be translated into maps and easily understood by planners, decision makers, public and other disaster management stakeholders. The objective of the paper is to evaluate published multistage geographical, geological, and environmental susceptibility maps and highlight the importance of engineering geological investigation through three landslide disaster case studies in community on landslide-proned slope land area in Northern Taiwan.